Dispersive analysis of Λ b → Λ(1520) local form factors
Abstract We perform an analysis of Λ b → Λ(1520) local form factors. We use dispersive techniques to provide a model-independent parametrisation of the form factors that can be used in the whole kinematic region. We use lattice QCD data to constrain the free parameters in the form factors expansion,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-02-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP02(2023)010 |
| _version_ | 1797779126195585024 |
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| author | Yasmine Amhis Marzia Bordone Méril Reboud |
| author_facet | Yasmine Amhis Marzia Bordone Méril Reboud |
| author_sort | Yasmine Amhis |
| collection | DOAJ |
| description | Abstract We perform an analysis of Λ b → Λ(1520) local form factors. We use dispersive techniques to provide a model-independent parametrisation of the form factors that can be used in the whole kinematic region. We use lattice QCD data to constrain the free parameters in the form factors expansion, which is further constrained by endpoint relations, dispersive bounds, and SCET relations. We analyse different scenarios, where we expand the form factors up to different orders, and their viability. Finally, we use our results to obtain predictions for some observables in Λ b → Λ(1520)ℓ + ℓ − decays, as the differential branching ratio, the forward-backwards lepton asymmetry and the branching ratio of Λ b → Λ(1520)γ. Finally, we provide a python notebook based on the software EOS to reproduce our result. |
| first_indexed | 2024-03-12T23:27:15Z |
| format | Article |
| id | doaj.art-79d5cb6f3efd44148e36957838aa0a5c |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-12T23:27:15Z |
| publishDate | 2023-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-79d5cb6f3efd44148e36957838aa0a5c2023-07-16T11:06:00ZengSpringerOpenJournal of High Energy Physics1029-84792023-02-012023212310.1007/JHEP02(2023)010Dispersive analysis of Λ b → Λ(1520) local form factorsYasmine Amhis0Marzia Bordone1Méril Reboud2Université Paris-Saclay, CNRS/IN2P3, IJCLabTheoretical Physics Department, CERNPhysik Department, Technische Universität MünchenAbstract We perform an analysis of Λ b → Λ(1520) local form factors. We use dispersive techniques to provide a model-independent parametrisation of the form factors that can be used in the whole kinematic region. We use lattice QCD data to constrain the free parameters in the form factors expansion, which is further constrained by endpoint relations, dispersive bounds, and SCET relations. We analyse different scenarios, where we expand the form factors up to different orders, and their viability. Finally, we use our results to obtain predictions for some observables in Λ b → Λ(1520)ℓ + ℓ − decays, as the differential branching ratio, the forward-backwards lepton asymmetry and the branching ratio of Λ b → Λ(1520)γ. Finally, we provide a python notebook based on the software EOS to reproduce our result.https://doi.org/10.1007/JHEP02(2023)010Bottom QuarksRare Decays |
| spellingShingle | Yasmine Amhis Marzia Bordone Méril Reboud Dispersive analysis of Λ b → Λ(1520) local form factors Journal of High Energy Physics Bottom Quarks Rare Decays |
| title | Dispersive analysis of Λ b → Λ(1520) local form factors |
| title_full | Dispersive analysis of Λ b → Λ(1520) local form factors |
| title_fullStr | Dispersive analysis of Λ b → Λ(1520) local form factors |
| title_full_unstemmed | Dispersive analysis of Λ b → Λ(1520) local form factors |
| title_short | Dispersive analysis of Λ b → Λ(1520) local form factors |
| title_sort | dispersive analysis of λ b λ 1520 local form factors |
| topic | Bottom Quarks Rare Decays |
| url | https://doi.org/10.1007/JHEP02(2023)010 |
| work_keys_str_mv | AT yasmineamhis dispersiveanalysisoflbl1520localformfactors AT marziabordone dispersiveanalysisoflbl1520localformfactors AT merilreboud dispersiveanalysisoflbl1520localformfactors |